It began in Manchester - a converted church, Jimmy Savile and groups like the Beatles, the Dave Clark Five and the Rolling Stones. It was 6.34pm on 1 January 1964. Tonight, on the eve of the 25th birthday of what has become the world's longest-running regular chart show, You are invited to join a host of your favourite DJs. There will be studio performances by, among others, Sandie Shaw, Cliff Richard, David Essex , Lulu, Wet Wet Wet, Status Quo, Shakin' Stevens, the Pet Shop Boys and a few surprise guests. Paul Gambaccini and Mike Read guide you through the 25 years.